Battery check Mercedes-Benz SLK 2005 - 2011 | Haynes Manuals
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Locate the battery
Open the battery cover - carefully undo the retaining fixings
Next, check the Negative (-) terminal clamp is tight
Check the Positive (+) terminal clamp is tight. CAUTION If using a spanner to tighten terminal, be careful not to short it on the bodywork
Check battery is generally secure, if loose, tighten the battery retainer
To tighten, a 10mm socket is needed. Not too tight because you may damage the battery casing. Replace the battery cover